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impedance of the amplifier is low enough to drive an 8 ohm speaker directly The coupling capacitor value is picked to pass audio signals down to 100 cycles by matching the reactance of the capacitor with the speaker impedance Due to the high input resistance of the amplifier (50 k), the audio coupling capacitor C3 can be as small as 01 F The equivalent resistance at the junction of R8 and VR3 is approximately 66 k (the parallel combination of R8, VR3 and the 50 k input impedance of the LM-386) The capacitor C2 and this equivalent resistance sets the 3 dB corner used to attenuate any IF voltage at pin 13 A simple RC filter attenuates at a rate of 6 dB per octave (an octave is the same as doubling the frequency) By using 66 k as the equivalent resistance and 0005 F as the capacitance, we get a 3 dB corner at approximately 48 kHz To get to 455 kHz, you must double 48 kHz approximately 66 times This equates to a reduction of the IF voltage at the R8 - VR3 junction of 396 dB (6 dB per octave times 66 octaves), or 95 times

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unwanted amplitude variations in the received signal, but minor frequency variations Noise immunity is one of the great advantages of frequency modulation over amplitude modulation The remaining signal contains only the frequency modulation The 6N2 receiver uses a quadrature detector to demodulate the FM signal After the noise is removed by the limiter, the signal is internally connected to the quadrature detector A parallel tuned circuit must be connected from pin 12 to the power supply This circuit produces the 90 phase needed by the quadrature detector A resistor shunting this coil sets the peak separation of the detector If the value of the resistor is lowered, it will increase the linearity, but decrease the amplitude of the recovered audio The quadrature detector combines two phases of the I-F signal that are 90 apart, or in quadrature, to recover the modulation The shifted signal is used to gate the non-shifted signal in a synchronous detector When the frequency increases above the carrier frequency (positive deviation), the phase shift increases causing a decrease in the width of the gated impulse output In a similar manner, when negative deviation occurs, the gated impulse output will widen The gated output is then filtered to remove the pulses and recover the modulating signal

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In working with FM receivers, there are some terms that need to be defined First, let s determine the term deviation as the frequency swing of the incoming FM signal When no modulation is present, the incoming signal is a fixed frequency carrier wave (Fc) Positive deviation (Fp) is the increase in Fc due to modulation, and negative deviation (Fn) is the decrease in Fc due to the modulation The detector must be linear over the maximum total deviation (Fp max - Fn max) produced by the transmitter or distortion will occur Before the second I-F signal reaches the detector, it is applied to a limiting amplifier inside the integrated circuit A limiting amplifier is designed to remove any amplitude variations in the signal by amplifying the signal well beyond the limit of the amplifier The frequency variations (FM) are not affected by the limiter The limiter removes the affects of fading (driving through a tunnel) and impulse noise (lightning and ignition) These affects produce significant

Source: Wireless Mobile Networking with ANSI-41

455 kHz conversion blocks 3 & 4

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Part 2:

The first local oscillator should be set at 1333 MHz to 1373 MHz for the 2-meter band and 393 MHz to 433 MHz for the 6-meter band This oscillator is freerunning varactor-tuned The first mixer converts the RF input to an I-F frequency of 107 MHz This I-F signal is then filtered through a ceramic filter and fed into the second mixer If the oscillator of the second mixer is precisely set at 10245 MHz, it will produce an output containing the sum (20945 MHz) and the difference (0455 MHz or 455 kHz) frequencies This 455 kHz signal is then sent to the limiter, detector, and audio circuits The mixers are doubly balanced to reduce spurious (unwanted) responses The first and second mixers have conversion gains of 18 to 22 dB respectively

In this chapter, we discuss the ANSI-41 mobile telecommunications network functions related to authentication These functions are divided into the following categories:1

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